Problem with new Passenger Module and rewrite rules

Hi,
I've got a problem, I'm trying to get the new nginx passenger module (phusion.nl) to work with some rewrite rules.
The cache files for a multisite app (mephisto) are located in /cache/domain.tld/
I want to rewrite the following:
/ -> /cache/example.com/index.html
/about/ -> /cache/example.com/about.html
/images/fu.jpg -> /cache/example.com/images/fu.jpg
my rules are basically as follows (inside the server block):
rewrite ^/$ /cache/$host/index.html break;
rewrite ^([^.]+?)/?$ /cache/$host$1.html break;
location ~ ^/(images|javascripts|stylesheets)/ {
if (!-e $request_filename) {
rewrite ^/(images|javascripts|stylesheets)/(.+)$ /cache/$host/$1/$2 last;
}
}
This works fine if the cached files exist, however, if they don't in which case the passenger module should forward the request
to the actual app, it doesn't.
The app doesn't get any request.... and I don't know why...
Can anyone tell me why this happens?
Posted at Nginx Forum: http://forum.nginx.org/read.php?2,1521,1521#msg-1521